feat(flow): on-demand host handoff with reliable return and a back-tap tip
Keyboard
- Only jump to the app when the voice surface is shown (tab tap / opened
there); typing tabs no longer leave the host on keyboard open.
- Wait up to 0.4 s for the arbiter to report the host app before leaving,
and late-bind an id that arrives within 6 s of the jump.
- Empty arbiter callbacks no longer wipe an already captured host id;
install the capture handler in every build configuration.
App
- Return to the previous app with up to four retries using iOS's real
open result, and honor the skip-app-switch preference.
- Keep the pending host id across cold-start zombie reconciliation, and
expire it after two minutes (legacy values without a timestamp stay valid).
- Show a light tip pointing at the system back control when we cannot
return automatically ("点击返回,立即使用").
Tests: TTL behaviour and return retry policy.
This commit is contained in:
@@ -3,13 +3,26 @@
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//
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// 识别当前宿主 App 的 bundle ID,供冷启动跳转主 App 后自动跳回。
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// 依赖私有 arbiter 探针(`OSGHostArbiterProbe`),Debug / TestFlight / Release 均生效;
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// 探针装不上(系统 < 26.4、私有符号改名)时识别结果为 nil,退化为“不自动跳回”。
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// 探针装不上(系统 < 26.4、私有符号改名)时识别结果为 nil,退化为“不自动跳回”,
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// 主 App 随后会显示“点击左上角返回”的提示作为兜底。
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// 调试日志与首页测试卡片仍只在 DEBUG 编译。
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import Foundation
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import os
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import OSGKeyboardShared
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enum HostAppIdentity {
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/// 跳转前最多等多久让 arbiter 回调送达。回调通常在毫秒级到达,
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/// 0.4 秒既覆盖慢回调,又不会让用户感觉“点了没反应”。
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static let handoffWaitTimeout: TimeInterval = 0.4
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/// 跳转之后,迟到的回调仍可补写返回目标的窗口。
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/// 覆盖主 App 冷启动到“就绪”的这段时间;就绪之后才读目标,所以迟到也来得及。
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static let lateBindWindow: TimeInterval = 6
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/// 晚绑定窗口的截止时间;回调可能在任意线程,用锁保护。
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private static let lateBindDeadline = OSAllocatedUnfairLock<Date?>(initialState: nil)
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/// 最近一次识别到的宿主;识别不到、或宿主是 OSG 自己时为 nil。
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static var currentBundleId: String? {
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guard let bundleId = OSGHostArbiterProbe.lastCapturedBundleId,
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@@ -19,16 +32,63 @@ enum HostAppIdentity {
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return bundleId
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}
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/// 探针钩子是否装上了。没装上时等待没有意义,直接跳过。
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static var isProbeInstalled: Bool {
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OSGHostArbiterProbe.isInstalled
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}
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/// 安装回调处理器(所有构建)。每次 arbiter 回调:
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/// 1. DEBUG 下写日志;
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/// 2. 若正处于“刚发起跳转”的晚绑定窗口内,把新识别到的宿主补写进 App Group。
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/// 探针只有一个处理器槽,所以日志与晚绑定必须合并在这里。
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static func installCaptureHandler() {
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OSGHostArbiterProbe.setCaptureHandler { @Sendable bundleId, detail in
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#if DEBUG
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HostBundleProbeLog.append(event: "arbiter", bundleId: bundleId, detail: detail)
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#endif
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guard let bundleId, !bundleId.isEmpty,
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!HostAppURLRegistry.isOwnBundleId(bundleId),
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isLateBindWindowOpen() else {
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return
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}
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// App Group 写入统一回到主线程(`FlowSessionBridge` 只在主线程同步)。
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DispatchQueue.main.async {
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FlowSessionBridge.setPendingHostBundleId(bundleId)
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#if DEBUG
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HostBundleProbeLog.append(event: "late-bind", bundleId: bundleId, detail: "published")
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#endif
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}
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}
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}
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/// 键盘弹出时主动让 arbiter 回调一次,避免宿主没变时拿不到最新 ID。
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static func refreshOnPresentation() {
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OSGHostArbiterProbe.pingArbiter()
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}
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/// 跳转主 App(`startflow`)前调用:把当前宿主写进 App Group,主 App 就绪后据此跳回。
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/// 跳转前调用:尽量拿到宿主 ID,但最多等 `timeout`。
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/// 已经有值就立刻返回;探针没装上也立刻返回 nil;其余情况 ping 一次后短轮询。
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@MainActor
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static func resolveForHandoff(timeout: TimeInterval = handoffWaitTimeout) async -> String? {
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if let bundleId = currentBundleId { return bundleId }
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guard isProbeInstalled else { return nil }
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OSGHostArbiterProbe.pingArbiter()
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let deadline = Date().addingTimeInterval(timeout)
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while Date() < deadline {
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try? await Task.sleep(nanoseconds: 40_000_000)
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if let bundleId = currentBundleId { return bundleId }
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}
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return currentBundleId
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}
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/// 跳转主 App(`startflow`)前调用:把当前宿主写进 App Group,主 App 就绪后据此跳回,
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/// 并打开晚绑定窗口,让迟到的回调也能补上。
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/// 识别不到时写 nil,清掉上一次残留,避免跳回错误的 App。
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static func publishReturnTarget() {
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let bundleId = currentBundleId
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FlowSessionBridge.setPendingHostBundleId(bundleId)
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lateBindDeadline.withLock { $0 = Date().addingTimeInterval(lateBindWindow) }
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#if DEBUG
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let returnable = HostAppURLRegistry.lookup(bundleId: bundleId) != nil
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HostBundleProbeLog.append(
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@@ -42,19 +102,20 @@ enum HostAppIdentity {
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/// 键盘收起时作废识别结果,下次弹出由新回调重新填充。
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static func invalidate() {
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OSGHostArbiterProbe.invalidateCapturedBundleId()
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lateBindDeadline.withLock { $0 = nil }
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}
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private static func isLateBindWindowOpen() -> Bool {
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lateBindDeadline.withLock { deadline in
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guard let deadline else { return false }
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return Date() < deadline
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}
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}
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}
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#if DEBUG
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/// 调试:把探针回调写进 App Group,主 App 首页的测试卡片读取展示。
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/// 调试:键盘弹出时记一条标记,主 App 首页的测试卡片读取展示。
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enum HostBundleProbe {
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/// 只需安装一次;回调可能来自非主线程,闭包必须是 nonisolated。
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static func installLogging() {
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OSGHostArbiterProbe.setCaptureHandler { @Sendable bundleId, detail in
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HostBundleProbeLog.append(event: "arbiter", bundleId: bundleId, detail: detail)
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}
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}
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/// 键盘弹出时记一条标记,便于把记录和每次弹出对应起来(ping 由 `HostAppIdentity` 负责)。
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static func recordPresentation() {
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HostBundleProbeLog.append(
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@@ -19,7 +19,8 @@ typedef void (^OSGHostArbiterCaptureHandler)(NSString *_Nullable bundleId, NSStr
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/// 钩子是否已成功安装(私有类或方法不存在时为 NO)。
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@property (class, nonatomic, readonly) BOOL isInstalled;
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/// 最近一次回调读到的宿主 bundle ID;回调读不到或已作废时为 nil。线程安全。
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/// 最近一次回调读到的有效宿主 bundle ID;从未读到或已作废时为 nil。线程安全。
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/// 读不到 ID 的空回调不会清掉它,只有 invalidateCapturedBundleId 会。
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@property (class, nonatomic, readonly, nullable) NSString *lastCapturedBundleId;
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/// 作废上一次的识别结果(键盘收起时调用,避免把上一个宿主当成当前宿主)。
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@@ -44,8 +44,12 @@ static void OSGSwizzledKeyboardChanged(id self, SEL _cmd, id change, id completi
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NSString *detail = change ? NSStringFromClass([change class]) : @"change=nil";
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os_unfair_lock_lock(&sLock);
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// 读不到 ID 的回调同样覆盖旧值:宿主已经变了,旧 ID 不能再用。
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sLastCapturedBundleId = bundleId.length > 0 ? bundleId : nil;
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// 只在读到有效 ID 时更新。读不到 ID 的回调(焦点切换、空事件)不再清掉已拿到的值:
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// 之前“最后一个事件为准”会让一次空回调把正确的宿主抹掉,是识别忽有忽无的来源之一。
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// 宿主真的变了,由键盘收起时的 invalidateCapturedBundleId 作废旧值。
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if (bundleId.length > 0) {
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sLastCapturedBundleId = bundleId;
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}
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OSGHostArbiterCaptureHandler handler = sHandler;
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os_unfair_lock_unlock(&sLock);
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if (handler) {
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